Planning for the weather is a good way to make your trip to Mutters relaxing and enjoyable, especially when you're splurging. The hottest months are usually July and August with an average temp of 57°F, while the coldest months are January and February with an average of 27°F. The rainiest months in Mutters are June, August, May, and July, with each month seeing an average of 9 inches of rainfall.